为提高水煤浆分散剂木质素磺酸钠的水溶性和负电性,以木质素磺酸钠(LS)、甲基丙烯磺酸钠(SMAS)和烯丙基聚氧乙烯醚(APEG)为原料,通过水溶液聚合法合成了木质素磺酸钠的接枝共聚物(LS-APEG-SMAS),通过傅里叶红外光谱(FTIR)对产物结构进行表征,并将其分散剂用于神华煤制浆.考察了吸附时间和分散剂浓度对饱和吸附量的影响,测定了分散之后煤的Zeta电位;采用傅里叶红外光谱表征了分散前后煤中官能团的变化,利用环境扫描电镜(ESEM)观察了分散前后煤的表观形貌.结果表明:当分散剂质量浓度为600 mg/L时,在25℃吸附12 h饱和吸附量达到8 mg/g,分散过程中Zeta电位由-8.54 mV降低到-31.5 mV,表明分散剂木质素磺酸钠的接枝共聚物对神华煤具有良好的分散稳定性.%In order to improve the water-soluble and negative performance of sodium lignosulphonate of coal water slurry dispersant,taking sodium lignosulphonate,sodium methacrylate and allyl polyoxyethylene ether as raw materials,the lignosulfonate graft copolymer (LS-APEG-SMAS) was synthesized by aqueous solution polymerization.The chemical structure of the product was characterized by Fourier Transform infrared spectroscopy (FTIR),and was applied to preparation coal water slurry with Shenhua Coal.The effects of adsorption time and concentration of dispersant on saturated adsorption capacity were investigated.The Zeta potential of the coal after dispersion was measured.The changes of functional groups in the coal before and after dispersion were characterized by FTIR.The surface morphology of coal before and after dispersion was observed by Environmental Scanning Electron Microscopy (ESEM).It is found that when the concentration of dispersant was 600 mg/L,the adsorption capacity reached 8 mg/g at 25℃ for 12 h,and the Zeta potential decreased from-8.54 mV to-31.5 mV during the dispersion.The results showed that LS-APEG-SMAS had good dispersion stability.
展开▼
